Planofilmpji co



A. G. NEWMAN.

GRINDING MILL.

APPLwMIoN FILED Nov. 19. 1915.

Patented July 29, 1919.

Y .animar-ca ors'rarrgiorfn; Iowa.

-GnrNDInG-MILL.

Specification offLetters Patent..

Patented muy a9.: 1era Apparati@ filedmmber 191 1?,.1151 Serial. N5

To all zwhom t may concern.'

Be it known thatd, ALBERT G.

acitizen ofthe-UnitedStates, at., Stanhope,` in the; coimtyq of HarInlton, and, Statey of. Iowa. have` invented.' Ceriale new? and useful Improvements 1n Grinding.

andffdo hereby declare-the. .follQW'Ikg-.t bf@ a full, clear, andfexact des criptioni,offmft'he,J

invention, "suchj aswillgenaloleothers skilled it appertainrslptgluake and: the primary object of). theinventionis, to provide improved means, of simplefmz:

struction, whereby the inner or male bur of a feed grinder is detachably held in position within the female bur, which means is operable, upon the insertion of foreign articles within the burs, for automatically releasing the male bur from connection with the power driving shaft, so as to arrest the rotation of the male bur and eliminate the mutilation of lhe grinding faces of the male and femaie urs.

With the foregoing and other objects in view this invention consists in such novel features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings and claimed.

In describing the invention in detail reference will be had to the accompanying drawings wherein like characters designate like and corresponding parts throughout the several views, and in which Figure 1 is a side elevation of a fragment of the feed grinder constructed in accord-ance with this invention.

Fig. 2 is a longitudinal section through Fig. 1,

Fig. 3 is an end view of the burs of the grinder, and

Fic. 4 is a section through the male bur showing parts disconnected.

Referring more particularly to the drawings, 1 designates the driving shaft of the feed grinder, which has the male bur structure 2 mounted thereon for rotation with the shaft. The male bur structure 2, includes, the disk 3 which has a plurality of rinding teeth 4 formed upon its inner sur ace and arranged in concentric spaced relation about the disk, and the hollow truncated cone 5 which extends inwardly into the female bur 6.1mm .the facrofthefdisk 3, upon which Surface of thedrawiiig's.

Thefdiar; 2.11%. aflanged ,Galler llgettaehe thereto, which flanged collar'is mounted upon the shaft 1 and is secured thereto by means of a set screw 12. The truncated cone section 5 of the male bur 2 is detachable from the disk 3, and is provided with a diametrically extending opening 14 adjacent its apex. 'Ihe opening 14 is adapted for alinement with an opening 15 extending diametrically through the shaft 1. The break pin 16, which is constructed of wood or analogous brittle material, is inserted through the openings 14 and 15 and keys the section 5 of the male bur to the shaft 1 for rotation therewith.

The disk 4 is provided with a central recess or depressed portion 20, the wall of which is inclined as is clearly shown at 21. The recess 20 which is formed in the inner face of the disk 4 is provided for receivin the reduced portion 22 of the frusto-conica section 5 of the male bur, as is clearly shown in Fig. 2 of the drawing. The circumference of the reduced portion 22 is inclined, as is shown at 23, for snugly fitting against the wall of the recess 20.

Any suitable type of mill frame may be used in connection with the burs illustrated and described in this application, without departing from the spirit of the invention.

In case foreign articles, such as rocks or the like, get within the grinding machine, the resistance offered by these foreign articles will be sufiicient to break the pin 16, which will stop or arrest the rotation of the truncated cone section 5 of the male bur 2 and prevent the mutilation of the grinding kfeed and faces of both the male and female urs.

In reducing the invention to practice, certain minor features of construction, combination and arrangement `oli/*parts may arater.from and inovablevindependently of bur consisting of a hollow frusto-conical body and an annular flange, a drive shaft extending aXially throughsaid body and rotatable with relation thereto, a male bur' f consisting of a frustofoonical body mounted on said shaft within the female body and I a disk head mounted .upon said shaft in engagement with said flange, a bolt lsecuring said head to said shaft against. axial and rotary movement with relation thereto, the

head securing the male body against axial movement with relationto the female body and shaft, and a breakable pin connecting said malel Abody and shaft for simultaneous' rotation, said male body member being sep'- said head when said pin is broken. 2.1Agrindingmmill.including a driving shaft, a male bur consistin of a hollow ."rusto-conical body and a disk head, said head being provided in its rear face with a recess having an inclined side wall, aVv forwardly.-eXtending annular flange on the front endof the body engaging in said recess and Vhaving an inclined outer sideen gaginglsaidkinclined wall of the recess, a' bushing located in the. rear end of said-body and surrounding the shaft, a break pin passing through the body and the bushing and the shaft', and a bolt securing the head to theshat.v 1 i In testimony whereof I afliX my signature" of two witnesses. e 'ALBERT NEWMAN. Witnesses:

Y O. M. ,WooDs, l C. KEsLER.

in presence l Copiesl of this patent may be obtained forve cents each, by addressing the Commissioner of Patents,

Washington,v I). G. 

